Have you ever stepped outside on a frigid, quiet morning and heard sounds emanating from somewhere far away? It's not your imagination—cold air really does carry sound farther. Sound begins with ...

A new startup is trying to scale up the idea of putting out fires using inaudible sound waves. Here & Now's Peter O'Dowd speaks with Sonic Fire Tech co-founder and CEO Geoff Bruder about how the ...

The top layer represents the location of the sound source and the path of sound propagation (A). The bottom layers represent convergence zones with different sound propagation paths (B-F). Sound waves ...